<style> body { overflow: scroll } div { width: 10px; height: 10px; background-color: #d64203; } </style> <body> <div id="a"></div> <div id="b"></div> <div id="c"></div> <div id="d"></div> <!-- Ensure that the scroller positioned the same way as it would be in the 'overflow: auto' case. We'll have scrollbars either way, but we don't want the '!=' reftest to spuriously succeed because of the scrollers. --> <div style="width: 500px; height: 500px; background-color: black"> </body> <script> // client{Width, Height} consist of the area _inside_ the scrollbars, so these // manually calculated units reflect the fact that with 'overflow: scroll' set, // viewport units are sized taking the scrollbars into account. var vw = 0.01 * document.body.clientWidth; var vh = 0.01 * document.body.clientHeight; var vmin = Math.min(vw, vh); var vmax = Math.max(vw, vh); document.getElementById('a').style.width = (50 * vw) + "px"; document.getElementById('b').style.height = (25 * vh) + "px"; document.getElementById('c').style.width = (35 * vmin) + "px"; document.getElementById('d').style.height = (25 * vmax) + "px"; </script>